Tamper and like impact tool



June 18, 1935. C. JACKSON TAMPER AND LIKE IMPACT TOOL Filed Aug. 20, 1930 Patented June 18, 1.935

UNITED STATES PATENT OFFICE Application August 20,

5 Claims.

I have illustrated my improvements in the accompanying drawing as adapted by me for tie tampers, although the structure illustrated, with proper modification in the tool, is adapted for use in other relations.

The main objects of this invention are:

First, to provide an improved impact tool of the class described which is highly efcient and convenient to use with little effort on the part of the operator.

Second, to provide an impact tool which-enables the performance of a very large amount of work by an operator.

Objects relating to details and economies of my invention will appear from the description to follow. The invention is defined and pointed out in the claims.

A structure which is a preferred embodiment of my invention is illustrated in the accompanying drawing, in which:

Fig. 1 is a side elevation partially broken away and central section.

Fig. 2 is an enlarged fragmentary view partially in section on line 2 2 of Fig. 1.

Referring to the drawing, I provide a casinglike body I having an electric motor housed therein, the rotor 2 of the motor being provided with a shaft 3 supported by bearings 4 and 5. On this shaft and between the bearings I mount an oval cam 6.

The cylindrical tool holder socket 'l is preferably formed integrally with a. partof the casing and is shouldered at 8. At its outer end this socket is provided with laterally projecting ears 9.

Within the socket I arrange a bushing I0 for the tappet II. This tappet is provided with a shoulder I2 coacting with the outer end of the bushing thereby limiting the inward movement of of my improved tool partially in vertical the tappet. 'Ihe tappet is supported in the bushing both for reciprocating and rotative movement.

Shims I3 are arranged between the shoulder 8 and the ange on the bushing so that the position of the tappet relative tov the cam is controlled by the number of these shims; that is, by inserting or removing shims, the inner position of the inner end of the tappet is controlled. 'Ihe right face at the inner end of the tappet is preferably ilat so that its rotation does not affect its relation rotate to distribute the does rotate so that the wear on the tappet is slight and is very uniformly distributed.

'I'he tool I4 is supported in operative relation to 1930, Serial N0. 476,606 (Cl. 12S-33) prevent rotative movement of the tool in the holder.

The tool is provided with a collar-like enlargement I6 ooaoting With the ends of the enlargement I1 in the tool holder to limit the stroke of the tool relative to the holder, the shoulder I8 at the outer en d of the enlargement I'I particularly serving as a stop.

In operation, the tool is brought into coacting relation with the tappet by an upward thrust on mounted, it being provided with ears I9 disposed oppositely of the ears 9 cam into contact with the Wick and lubricant is applied to the cam and carried thereby to the face bolts which Buffers 23 are ar- When the tool is in engagement with the work, the oval cam 6 acts to produce a rapid series of pressure impulses.

In use, the tool rests upon the work or material to be tamped and supports the weight of the casing-like body and the parts carried thereby,

In the comercial structure, the casing weighs approximately '10 pounds so that operation of the machine does not give a series of hammer-like lows but a rapid series of impulses backed by this weight, the force of the to the weight of kthe casing so that there is, in effect, a series of heavy pushes as distinguished from harnmer-like blows.

This not only results in effective packing of the material but accomplishes this result without crushing the ballast as occurs with pneumatic tools and the like where the hammer-.like blow is present.

I have illustrated and described my improvements inan embodiment which I have found highly satisfactory. I have not attempted to illustrate or describe certain other embodiments and adaptations as it is believed that this disclosure will enable those skilled in the art to embody or adapt the same as may be desired.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is:

1. In a structure of the class described, the combination of a casing-like body having a shouldered tool socket with laterally projecting ears at its outer end, a motor mounted within said casing and provided with a shaft disposed transversely of said socket, an oval cam on said shaft, said shaft being provided with supporting bearings at each side of said cam, a bushing for said socket having an out-turned flange at its lower end disposed in opposed relation to said shoulder of said socket, there being a plurality of adjusting shims disposed between said shoulder and flange, a shouldered tappet rotatively and reciprocatingly mounted in said bushing in coacting relation to said cam with its shoulder coacting with the end of the bushing to limit the inward movement of the tappet, said tappet having a substantially fiat right face at its inner end coacting with said cam, a tool holder engaged in said tool holder socket and provided with laterally projecting ears disposed oppositely to said ears on said tool holder socket, bolts arranged through said ears on said tool holder and tool holder socket, springs on said bolts whereby said tool holder is yieldingly supported, and a tool reciprocatingly mounted in said tool holder in coacting relation to said tappet and adapted when applied to the work to constitute a support for the body and parts carried thereby, said tool and tool holder having coacting stops limiting the outward movement of the tool.

2. In a structure of the class described, the combination of a casing-like body having a shouldered tool socket, a motor mounted within said casing and provided with a shaft disposed transversely of said socket, an oval cam on said shaft, said shaft being provided with supporting bearings at each side of said cam, a bushing for said socket having an out-turned flange at its lower end disposed in opposed relation to said shoulder of said socket, there being a plurality of adjusting shims disposed between said shoulder and ange, a shouldered tappet rotatively and reciprocatingly mounted in said bushing in coacting relation to said cam with its shoulder coacting with the end impulses being equal A dered tool socket, a

of the bushing to limit the inward movement of the tappet. said tappet having a substantially nat right face at its inner end coacting with said cam, a tool holder engaged in said tool holder socket, and a tool reciprocatingly mounted in said tool holder in coacting relation to said tappet and adapted when applied to the work to constitute a support for the body and parts carried thereby, said tool and tool holder having coacting stops limiting the outward movement of the tool.

3. In a structure of the class described, the combination of a casing-like body having a'shoulmotor mounted within said casing and provided with a shaft disposed transversely of said socket, a cam on said shaft, said shaft being provided with supporting bearings at each side of said cam, a bushing for said socket having an out-turned flange at its lower end disposed in opposed relation to said shoulder of said socket, there being a plurality of adjusting shims disposed between said shoulder and flange, a shouldered tappet rotatively and reciprocatingly mounted in said bushing in coacting relation to said cam with its shoulder coacting with the end of the bushing to limit the inward movement of the tappet, said tappet having a face at its inner end coacting with said cam, a tool holder engaged in saidv tool holder socket, and a tool reciprocatingly mounted in said tool holder in coacting relation to said tappet.

4. In a structure of the class described, the combination of a casing-like body having a shouldered tool socket, a motor mounted within said casing and provided with a shaft disposed transversely of said socket, a cam on said shaft, a. bushing for said socket having an out-turned flange at its vlower end disposed in opposed relation to said shoulder of said socket, adjusting means disposed between said shoulder and flange, a shouldered tappet rotatively and reciprocatingly mounted in said bushing in coacting relation to said cam with its shoulder coacting with the end of the bushing to limit the inward movement of the tappet, said tappet having a face at its inner end coacting with said cam, a tool holder engaged in said tool holder socket, and a tool reciprocatingly mounted in said tool holder in coacting relation to said tappet.

5. In a structure of the class described, the combination of a casing having an elongated bore provided with an enlarged end portion forming a shoulder, an elongated bushing fitting said bore and having an end flange fitting said enlarged end portion thereof, shims disposed between said shoulder and flange, a tool holder mounted on said casing and having an internally shouldered socket telescoped within said enlarged end por'- tion of the bore and engaging said end flange of the bushing, and a tappet disposed through said bushing and having a flange in said socket coacting with the shoulder thereof and the end flange of said bushing to limit the travel of the tappet, the position of the latter relative to the casing being changed by varying the number of said shims.

' CORWILL JACKSON. 

